Cutter head



Feb. 20, 1923.

R. Ff MORITZ CUTTER HEAD Filed Oct 8, 1921 1 ATTORNEYS Patented Feb. 29,1923.

mm m om ROBERT F. MORITZ, or caiannn, NEW JERSEY, essienon r0 seiaonr-M,

COMPANY, 013 CAMDEN,

Jansen-Mi oonrone'rron or new rfansnr,

; onr'rnn linen,

fippl ieation filed Getober 8,1921. Serial "as. 505,328."

To aZZ whom it may concern Be it known that I, ROBERT F. Monrrz,

a citizenuof the United States. and resident of Camden, in the county ofCamden and State of New Jersey, have invented certain new and usefulImprovements in Cutter Heads, of which the followingis a specification.n o This invention is an improvement in cutter heads adapted to besecured to a rotary shaft or other supporting element and r0- tated injuxtaposition to a cooperating cutter' or other element for slitting,trimming, or scoring sheet material. The invention relates particularlyto the means employed for securing the cutter in position and permittingof its adjustment lengthwise of the shaft, and includes-an expansibleand 'contractible split collar to carry thecu tter.

In constructions of this type heretofore employed, it has becircustomarytobore the split ringor collar to an internal diameter slightly largerthan the external diameter of the shaft. so that when in non-flexedcondition it could be vmoved freely along the shaft to the desired pointand then coni'racted by bringing togetherthe free ends at the slit togrip the shaft. In" such construct-ions the collar does not fier:uniformly during); the contraction and thus tends to engage the shaftnon-uniformly or at a few spaced points Furthermore, the collar when innormal or operative position is in distorted condition with. the metalunder strain. After it has remained clamped in place for a considerablelength of time the metal often becomes set and the releas ing of theconnecting screw at the slit does not result in the return of the collarto ex panded or non-flexed position, In thatcase it is a difficultoperation to force the collar open or drive it along the shaft inmaking;

an adjustment. Furthermore. the non-synr metrical contractio oftenbrings thocutter blade slightly eccentric or springs it 01 producesnmlesirahle bending strains in it.

In carrying out my invention I form the collar aperture of substantiallythe same diameter as the shaft, so that with the parts in normal orunfiexed condition, the collar its the shaft friction tight anduniformly about the entire circumference.- "lhe connecting meansen'iployed is'so designed that it acts to flex the collar by expandingi'tlo cured.

a larger diameter,.rather than contract-ind it; Thus the connectingmeans may be op 'ated to expand the collar to? a largerdiameterpern'iitting free longitudinal movement of the collar along the shaft;and then may be operated to relieve the collar of tensionand the collarwill contract to tightly and umformly fit the'shaft. A further operationof the connecting member serves to" tightly clamp the collar in placeand prevent any expansion '01- loosening. Thus the. collar when innormal clamped and operating position is not under anymaterial flexingstrain, truly concentric with the shaft, is: held by uniform and.extensive surfacecontact with the shaftpand' does notremain in'a flexedcondition vfor any appreciable time, so that the resilience is notdestroyed.

In the accompanying drawings illustrated one embodiment of my intention.In'these drawings, 4 v Figure l is'anend' view,- i l 19;. Qis atransverse section oirthe'line, 22 of Fig 1, 1

l igs. 3 and l are sectional Ci'GtEIllS'OZ L a" larger scale, and I vFig, 5 is a sectional detail similar to Fig.

3, but showing a slight modification.-

In my improved eonstruction'there is em ployed a'split ring or collar 10to which. the circular cutter blade 11 is detachably se At the two freeends 12 and 13 of the split ring thereis normally a narrow gap oropening; due to the-thickness of the saw or other tool, in makingthecut. These I two ends are. secured together by a screw 14; havingthreaded engagement with they end 12 and extending through an aperturein; a lug or transverse flange portion 15 of 1* have the other end, Theaperture. is" slightly larger than the screw so as to form. aelear once.Thescrew is provided with ahead 16 and directly .iirthe rear of this.head thereprovided a stop or transversenhut merit-17'preventingonlimiting the endwise movement of the screw in respect to the end 13.-This aliiutment'may be secured inipo; sijtion after the screw has beenput in place, and may be driven into slotsmto hold by friction, I or"may be" soldered "or ,.welded in place. The screw head is so formedthat the screw may be rotated, any [suitable means being provided forthis purpose." Prefcn ably the screw head has a. socket 18 into whichthe end of a suitable key may be extended. If the stop or abutment 1'?extend substantially across the entire screw head, then the abutment hasan aperture 19 as shown in Fig. 3 and in alignment with the socket 18 sothat the key may be inserted through the stop into the socket. In someconstructions the stop may be acompalra tively low, as shown at 17 inFig. 5, so that it covers only a portion of the screw head, and in thatcase it is not necessary to have any openingthrough it. The cutter ispreferably secured to the split ring b screws 20, three beingsufficient, and these are so spacedas to interfere tothe least possibleextent with any expansion or contraction of the split ring. The internaldiameter of the split ring is bored substantially the same as theexternal diameter of the shaft to which the ring is'to be applied.Before putting on the shaft, the screw 14 is rotated so that the head isforced against the stop 1'? andthe resulting reaction acts toseparate'the ends 12 and 13 and expand the ring. In this expandedcondition it may he slipped freely along the shaft to the desiredposition. By then retating the screw in the opposite direction the splitring or collar is permitted to re- .turn to normal position and totightly fit the exterior of the shaft. By further turning the screw, thetwo ends 12 and 13 may be drawn'tit'htly together and the cutter headlocked in place.

It will be, noted that in my improved construction the split ring whenin normal. and operative position is not flexed or bent from normal, andsnugly and uniformly fits the shaft. The only distortion or bending ofthe split ring is a temporary one occurring only during the adjustmentof the cutter head,.instead of a practically continuous one, as in priorconstructions. Furthermore, any bending; strains or warping of thecutter blade itself occurs only during adjustment, and the cutter bladeis not subjected to bending or distorting strains when the collar istightened and the parts are in position for use. 7

Although I have illustrated the innersurface or diameter of the ring;one continuous and substantially complete cylindrical surface it will ofcourse be evident that this is not essential and that the internalsurface of the ring which engages with the sliaft may be made up of aseries of spaced surfaces, all with the same radius and center.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is I 1. A cutter head including a split ringhaving free ends and when in non-flexed position presenting an innercurved surface adapted "to snugly lit a supporting shaft, a. cutterblade secured to said ring and a screw carried by one of said free endsand adapted to spread said ends apart and forcibly expand the ring tofacilitate the adjustment of the cutter head lengthwise of the shaft. 2.A cutter head including a split ring having free ends and when in nontlexed position presenting;- an inner curved surface adapted to snuglylit a supporting shaft, a cutter blade secured to said ring, and a screwcarried by one ofsaid free ends and adapted to spread said ends apartand forcibly expand the ring to facilitate the adjustment of the cutterhead lengthwise of the shaft,

' and also adapted to draw said ends together to lock the ring on theshaft.

' 3. A cutter -hcad including a split ring having; free ends and when inIlOI'lfflCXQCl position presenting an inner cylindrical snr-- face ofthe same diameter as the external surface of the supporting shaft; acutter blade secured to said ring and a screw having threaded engagementwith one end "and having a portion held against endwise movement inrespect to the other of said-ends, whereby the rotation of the screw inone direction acts to forcibly expand the ring to facilitate theadjustment of the cutter head lengthwise of the shaftr 4;. A cutter headincluding a split ring having free ends, a cutter blade secured to saidring, and a screw having; threaded en g'agement with one of said endsand e:-;tend.- ing through an aperture in the other of said ends, andhaving a head larger than said aperture, and said last mentioned endhaving" a stop in the rear of the head whereby said screw when rotatedinone direction may apply expandingpressure on said ring.

5. A cutter head including a split ring presenting; an internalcylindrical surface of a normal diametersubstantially the same as theexternal diameter of the supporting shaft. and means for expanding saidring to facilitate longitudinal adjustment of the cutter head along theshaft, including a screw having threaded engagement with one portion ofsaid ring and held against lengthwise movement in respect to another portion of said ring.

6. A cutter head including: an cxpansible and contractihle split ringwhich when in normal non-flexed condition presents an internaldiametersubstantially equal to the external diameter of the supportingshaft whereby when in normal operative position the metal of the ring;isin substantially nonflexed condition, means for expandin the ring: tolarger diameter by a flexing of the metal thereof to facilitatelongitudinal adjustment of the cutter head, and acutter blade secured tosaid ring.

Signed at Camden in the county of Camden and State of New Jersey this27th day of F eptember .s\. l). 1921 v

